Yes, it is the same valk, but it has differences in the mold comparing it to the Yamato. Not only will the internal structure be different, but the surface details and porportions as well. The Arcadia VF-0 as others said is completely different from the Yamato VF-0. I would say that, maybe the tires and the cockpit seat are the same . Other than that, the proportions of the whole valk were updated.
Comparing my Yamato Ivanov to the pics of the Arcadia I can see variations on the proportions. It has many adjustements here and there. It will be a whole new mold. Expensive, yes!!!